Display screen or portion thereof with a generated image



FIG. 1 is a front view of a display screen or portion thereof with a generated image showing my new design; and,

FIG. 2 is a front view thereof, in which a mobile terminal in broken lines is provided to illustrate an example environment.

The broken line drawing of the mobile terminal, and the text/words, numbers, symbols, and otherwise images shown in broken lines in the generated image of FIGS. 1 and 2 are for illustrative purposes only and form no part of the claimed design. 

CLAIM The ornamental design for a display screen or portion thereof with a generated image, as shown and described. 